Tragically, Chavez has been stuck in 2003 ever since.
You wouldn't think getting Chavez on the line would be easy. If it were, world leaders would constantly be getting calls from pranksters and other bored world leaders all hours of the night. But while the unofficial requirements (balls that can be used to anchor hot air balloons) are probably hard to come by, Ferrero and Santos only had to bluff their way past a few aides before using pre-recorded clips of Fidel Castro to chat with Chavez himself.
Eventually the hosts broke in with a few well reasoned, intellectual arguments (by which we mean they swore at him for a bit) and hung up. They received a fair bit of both praise and criticism, but they weren't finished yet.
A few months later they pulled the same stunt on Castro, this time using clips of their conversation with Chavez to pretend to be him. Now, pulling a prank on a head of state is kind of impressive, but ultimately you're still just phoning up some old guy and insulting him. Unless, of course, the head of state in question decides to start swearing back at you, at which point you have something greater. And a minor international incident.
When Castro realized what was going on he called the DJs "s**t eaters," "faggots" and, in a stunning display of ingenuity, "big faggots," along with a couple of other choice phrases before hanging up.